Re: UDP server socket
From: Ajay (abra9823_at_mail.usyd.edu.au)
Date: 10/14/04
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Date: Thu, 14 Oct 2004 23:28:37 +1000 To: python-list@python.org
Quoting Peter L Hansen <peter@engcorp.com>:
> Ajay wrote:
> > whats the maximum number of datagrams that can queue up on a UDP
> server
> > socket? or is that system dependent?
> > i have some code that iteratively handles datagrams, and while testing
> it,
> > i noticed that it responds to at most 3 datagrams (i tried sending 4,
> 6, 8
> > and 10 datagrams / second)
> > is that a system dependent feature or can i change that (i didn't see
> > anything in the manual)
>
> I don't believe (though I'm not an expert in UDP) that you can
> "queue up" UDP packets at all. At least, there are explicitly
> NO guarantees as to whether any given packet will even make it
> through the network, and I doubt any system provides explicit
> guarantees as to how many UDP packets can be handled if there
> is a backlog. If you are looking for reliable communications,
> that's what TCP is for... otherwise you have to handle missed
> or duplicated packets yourself.
>
> -Peter
> --
> http://mail.python.org/mailman/listinfo/python-list
>
i am afraid i have to stick with UDP and reliability is no issue. i used
the word queue but what i really meant was buffer and what i really want
to know is how many packets get buffered (the ones that make through).
i dont believe that when i send 10 packets, 7 get lost and 3 make it
through. Since when i send 3, i always get all 3 (well except perhaps once
or twice) but i can never get any more than 3. i want to confirm if this is
a buffering issue
in my code i do something like
while 1:
data, address = self.UDPserversocket.recvfrom(1024)
#do a lot of processing which usually takes between 4-8 seconds
my question is whether the socket buffers incoming packets, what is the
size of the buffer and is there any way of increasing it.
If not, a solution may be to carry the processing in another thread, but
thats going to increase the overhead (the app. is for a PDA).
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